// Copyright 2016 Google Inc. All rights reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

package cc

import (
	"fmt"
	"path/filepath"
	"strings"

	"android/soong/android"
)

func init() {
	android.RegisterMakeVarsProvider(pctx, makeVarsProvider)
}

func makeVarsProvider(ctx android.MakeVarsContext) {
	ctx.Strict("LLVM_PREBUILTS_VERSION", "${clangVersion}")
	ctx.Strict("LLVM_PREBUILTS_BASE", "${clangBase}")
	ctx.Strict("LLVM_PREBUILTS_PATH", "${clangBin}")
	ctx.Strict("CLANG", "${clangBin}/clang")
	ctx.Strict("CLANG_CXX", "${clangBin}/clang++")
	ctx.Strict("LLVM_AS", "${clangBin}/llvm-as")
	ctx.Strict("LLVM_LINK", "${clangBin}/llvm-link")
	ctx.StrictSorted("CLANG_CONFIG_UNKNOWN_CFLAGS", strings.Join(clangUnknownCflags, " "))

	hostType := android.CurrentHostType()
	arches := ctx.Config().HostArches[hostType]
	makeVarsToolchain(ctx, "", android.Host, hostType, arches[0])
	if len(arches) > 1 {
		makeVarsToolchain(ctx, "2ND_", android.Host, hostType, arches[1])
	}

	if winArches, ok := ctx.Config().HostArches[android.Windows]; ok {
		makeVarsToolchain(ctx, "", android.Host, android.Windows, winArches[0])
		if len(winArches) > 1 {
			makeVarsToolchain(ctx, "2ND_", android.Host, android.Windows, winArches[1])
		}
	}

	arches = ctx.Config().DeviceArches
	makeVarsToolchain(ctx, "", android.Device, android.NoHostType, arches[0])
	if len(arches) > 1 {
		makeVarsToolchain(ctx, "2ND_", android.Device, android.NoHostType, arches[1])
	}
}

func makeVarsToolchain(ctx android.MakeVarsContext, secondPrefix string,
	hod android.HostOrDevice, ht android.HostType, arch android.Arch) {
	var typePrefix string
	if hod.Host() {
		if ht == android.Windows {
			typePrefix = "HOST_CROSS_"
		} else {
			typePrefix = "HOST_"
		}
	} else {
		typePrefix = "TARGET_"
	}
	makePrefix := secondPrefix + typePrefix

	toolchain := toolchainFactories[hod][ht][arch.ArchType](arch)

	var productExtraCflags string
	var productExtraLdflags string
	if hod.Device() && Bool(ctx.Config().ProductVariables.Brillo) {
		productExtraCflags += "-D__BRILLO__"
	}
	if hod.Host() && Bool(ctx.Config().ProductVariables.HostStaticBinaries) {
		productExtraLdflags += "-static"
	}

	ctx.Strict(makePrefix+"GLOBAL_CFLAGS", strings.Join([]string{
		toolchain.Cflags(),
		"${commonGlobalCflags}",
		fmt.Sprintf("${%sGlobalCflags}", hod),
		toolchain.ToolchainCflags(),
		productExtraCflags,
	}, " "))
	ctx.Strict(makePrefix+"GLOBAL_CONLYFLAGS", "")
	ctx.Strict(makePrefix+"GLOBAL_CPPFLAGS", strings.Join([]string{
		"${commonGlobalCppflags}",
		toolchain.Cppflags(),
	}, " "))
	ctx.Strict(makePrefix+"GLOBAL_LDFLAGS", strings.Join([]string{
		toolchain.Ldflags(),
		toolchain.ToolchainLdflags(),
		productExtraLdflags,
	}, " "))
	ctx.Strict(makePrefix+"SYSTEMCPP_CPPFLAGS", toolchain.SystemCppCppflags())
	ctx.Strict(makePrefix+"SYSTEMCPP_LDFLAGS", toolchain.SystemCppLdflags())

	includeFlags, err := ctx.Eval(toolchain.IncludeFlags())
	if err != nil { panic(err) }
	ctx.StrictRaw(makePrefix+"C_INCLUDES", strings.Replace(includeFlags, "-isystem ", "", -1))

	if arch.ArchType == android.Arm {
		flags, err := toolchain.InstructionSetFlags("arm")
		if err != nil { panic(err) }
		ctx.Strict(makePrefix+"arm_CFLAGS", flags)

		flags, err = toolchain.InstructionSetFlags("thumb")
		if err != nil { panic(err) }
		ctx.Strict(makePrefix+"thumb_CFLAGS", flags)
	}

	if toolchain.ClangSupported() {
		clangPrefix := secondPrefix + "CLANG_" + typePrefix
		clangExtras := "-target " + toolchain.ClangTriple()
		if ht != android.Darwin {
			clangExtras += " -B" + filepath.Join(toolchain.GccRoot(), toolchain.GccTriple(), "bin")
		}

		ctx.Strict(clangPrefix+"GLOBAL_CFLAGS", strings.Join([]string{
			toolchain.ClangCflags(),
			"${commonClangGlobalCflags}",
			fmt.Sprintf("${%sClangGlobalCflags}", hod),
			toolchain.ToolchainClangCflags(),
			clangExtras,
			productExtraCflags,
		}, " "))
		ctx.Strict(clangPrefix+"GLOBAL_CONLYFLAGS", "${clangExtraConlyflags}")
		ctx.Strict(clangPrefix+"GLOBAL_CPPFLAGS", strings.Join([]string{
			"${commonClangGlobalCppflags}",
			toolchain.ClangCppflags(),
		}, " "))
		ctx.Strict(clangPrefix+"GLOBAL_LDFLAGS", strings.Join([]string{
			toolchain.ClangLdflags(),
			toolchain.ToolchainClangLdflags(),
			productExtraLdflags,
			clangExtras,
		}, " "))

		if hod.Device() {
			ctx.Strict(secondPrefix + "ADDRESS_SANITIZER_RUNTIME_LIBRARY", strings.TrimSuffix(toolchain.AddressSanitizerRuntimeLibrary(), ".so"))
		}

		// This is used by external/gentoo/...
		ctx.Strict("CLANG_CONFIG_" + arch.ArchType.Name + "_" + typePrefix + "TRIPLE",
			toolchain.ClangTriple())
	}

	ctx.Strict(makePrefix+"CC", gccCmd(toolchain, "gcc"))
	ctx.Strict(makePrefix+"CXX", gccCmd(toolchain, "g++"))

	if ht == android.Darwin {
		ctx.Strict(makePrefix+"AR", "${macArPath}")
	} else {
		ctx.Strict(makePrefix+"AR", gccCmd(toolchain, "ar"))
		ctx.Strict(makePrefix+"READELF", gccCmd(toolchain, "readelf"))
		ctx.Strict(makePrefix+"NM", gccCmd(toolchain, "nm"))
	}

	if ht == android.Windows {
		ctx.Strict(makePrefix+"OBJDUMP", gccCmd(toolchain, "objdump"))
	}

	if hod.Device() {
		ctx.Strict(makePrefix+"OBJCOPY", gccCmd(toolchain, "objcopy"))
		ctx.Strict(makePrefix+"LD", gccCmd(toolchain, "ld"))
		ctx.Strict(makePrefix+"STRIP", gccCmd(toolchain, "strip"))
		ctx.Strict(makePrefix+"GCC_VERSION", toolchain.GccVersion())
		ctx.Strict(makePrefix+"NDK_GCC_VERSION", toolchain.GccVersion())
	}

	ctx.Strict(makePrefix+"TOOLCHAIN_ROOT", toolchain.GccRoot())
	ctx.Strict(makePrefix+"TOOLS_PREFIX", gccCmd(toolchain, ""))
	ctx.Strict(makePrefix+"SHLIB_SUFFIX", toolchain.ShlibSuffix())
	ctx.Strict(makePrefix+"EXECUTABLE_SUFFIX", toolchain.ExecutableSuffix())
}